Merge branch 'main' into '#106'

backend/app/models/deerjikist.rb

@@ -0,0 +1,21 @@
+class Deerjikist < ApplicationRecord
+  self.primary_key = :platform, :code
+
+  belongs_to :tag
+
+  validates :platform, presence: true
+  validates :code, presence: true
+  validates :tag_id, presence: true
+
+  validate :tag_must_be_deerjikist
+
+  enum :platform, nico: 'nico', youtube: 'youtube'
+
+  private
+
+  def tag_must_be_deerjikist
+    if tag && !(tag.deerjikist?)
+      errors.add :tag, 'タグはニジラー・カテゴリである必要があります．'
+    end
+  end
+end

backend/app/models/tag.rb

@@ -24,6 +24,8 @@ class Tag < ApplicationRecord
 
   has_many :tag_similarities, dependent: :delete_all
 
+  has_many :deerjikists, dependent: :delete_all
+
   belongs_to :tag_name
   delegate :wiki_page, to: :tag_name
 
@@ -42,6 +44,7 @@ class Tag < ApplicationRecord
 
   validate :nico_tag_name_must_start_with_nico
   validate :tag_name_must_be_canonical
+  validate :category_must_be_deerjikist_with_deerjikists
 
   scope :nico_tags, -> { where(category: :nico) }
 
@@ -154,4 +157,10 @@ class Tag < ApplicationRecord
       errors.add :tag_name, 'tag_names へは実体を示す必要があります．'
     end
   end
+
+  def category_must_be_deerjikist_with_deerjikists
+    if !(deerjikist?) && deerjikists.exists?
+      errors.add :category, 'ニジラーと紐づいてゐるタグはニジラー・カテゴリである必要があります．'
+    end
+  end
 end